Weldable aluminum product and welded structure comprising such a product

Inactive Publication Date: 2002-01-08
CORUS ALUMINUM WALZPRODUKTE GMBH (DE)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In a severe and undesirable case even an undercut may be formed.
The heat-affected zone in Mg-containing alloys in particular has usually the worst microstructure with respect to corrosion r

Method used

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  • Weldable aluminum product and welded structure comprising such a product
  • Weldable aluminum product and welded structure comprising such a product

Examples

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example 1

In an example in accordance with the invention sheets of core alloy forming the structural component of 7 mm thickness having the composition of, in weight percent, 2.56% Mg, 1.14% Mn, 0.29% Zn, 1.11% Si, 0.46% Fe, balance aluminum and inevitable impurities are clad by roll-bonding on both sides with AA7072 alloy layers each of 6% thickness of the core alloy and having a corrosion potential lower than that of the core alloy. Pairs of these sheets were welded by means of MIG and TIG. The welding configuration was head-to-head, often also referred to as butt-weld samples. After welding the angle .alpha. between the parent plate and the weld metal was 130.degree. or more and further showed no undercuts, which will result in an increase in fatigue life. In this case, the composition of the alloy of the structural component (core sheet) was a non-standard scrap one, in order to test the welding result.

example 2

Pairs of unclad AA5083 plates, unclad AA5059 plates and AA5059 plates clad on both sides with an AA7072 layer were butt-welded by MIG using AA5183 filler wire. These plates were made on a laboratory scale. The effects of the clad layer on tensile properties, corrosion resistance and weld geometry have been investigated. The plates are 8 mm thick. In the case of the clad plate, the thickness of each of the AA7072 clad layers was 2% of the total thickness of the product.

In the welding, the welding speed was 0.7 m / min., the gas was Ar, and three weld passes were made.

All plates were of temper H321. The AA5059 alloy and the AA7072 alloy clad had the following compositions:

balance Al and inevitable impurities.

balance Al and inevitable impurities.

The clad layers were applied by roll-bonding.

The properties of the unwelded plates were established using small Euronorm-specimens and tested according to the EN 10002 specification. The cross weld tensile specimens have been machined according t...

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Abstract

Improved shape and strength of the weld in a welded structure are obtained by use of a weldable aluminum product comprising a structural component which is a sheet, a plate or an extruded body and is made of an aluminum alloy containing not more than 1.5 wt % Zn. This component has, adhered on at least one side, a cladding layer made of an AA7xxx-series alloy having a corrosion potential lower than that of the alloy of the structural component. The alloy of the structural component is preferably an AA5xxx-series alloy containing Mg in the range 2 to 6 wt %.

Description

The invention relates to a weldable aluminum product comprising a structural component in the form of sheet or plate product or an extruded product, for use as a structural member in a welded structure. Further the invention relates to a welded structure comprising at least one such aluminum product. Such welded structures include marine structures e.g. fixed structures, ships, aerospace vehicles, and land vehicles such as trucks, dump trucks, cars (automobiles) and railway vehicles. While in the following description of this invention reference is mainly made to aluminum sheet or plate products, it is to be understood that products based on aluminum extrusions are also included. As is conventional, the term "aluminum product" refers to aluminum alloy products.BACKGROUND OF THE PRESENT INVENTIONWhen welding aluminum plates or sheets by means of fusion welding, such as MIG, TIG or plasma welding, in particular plates or sheets made of the Aluminum Association AA5xxx-series alloys hav...

Claims

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Application Information

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IPC IPC(8): B32B15/01C22C21/06C22C21/00
CPCB23K9/23B23K10/02B23K26/3226B32B15/016C22C21/06C22C21/10B23K2203/10Y10T428/12493Y10S428/934Y10S428/926Y10S428/925Y10S428/933Y10T428/12764B23K26/32B23K2103/10
Inventor HASZLER, ALFRED JOHANN PETERMECHSNER, KLAUS ALFONS
Owner CORUS ALUMINUM WALZPRODUKTE GMBH (DE)
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